Problem with nvidia raid and grub2

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It’s not the first time I have some trouble to setup grub2 correctly with my nvidia raid system (also called fake-raid) … I did not find exactly why, but for sure i never try to install grub2 correctly from yast or in manual mode.

The first solution to find was : how to boot a fresh installed system when the bootloader has not been configured. The solution is here : http://www.supergrubdisk.org. This tool is really simple and so efficient to boot !  I recommend to have this in your linux emergency kit !

The second solution, once the system has start is to reinstall a bootloader. Here, in fact the solution is easy : destroy this f**** grub2 and replace it by the legacy really good grub ! lol

Then it works … last step to me: understand why gnome is taking so long to start ?!? or the answer is in the question …

I love Linux !

Introduction to Internet of Things

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Recently I made a presentation on Internet of Things for ClermontTech ApiHour show ; normally video should be published soon. For those who are interesting in this topic, here are the slides with the associated comments.

http://slid.es/disk91/internetofthings

Have fun !

Makefile quick how-to

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Many years ago, I was considering myself as a specialist of Makefiles … But now, I know that Makefile science is not like bicycle and you may loose all this knowledge as soon as you start to java Code …

So I’ve to go back to Makefile school again and here are some of my googling notes on this topic for my own remembers and why not yours !

 

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Program Yabbas (AtMega328p) Over FTDI cable

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The last step to use a ATMega328P / Yabbas from the Arduino IDE is to plug it with a FTDI cable (TTL RS232 over USB). Personnally, I’m using the TTL-232R-3V3 to do it. The first step was to create an adaptor to transform this cable output to the YABBAS pinout.

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How to burn AtMega328P arduino bootloader on Yabbas

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Recently I made a Yabbas arduino system ; this is a low cost arduino (7€) you can DIY. I’ve made it with a group of people from my city (look here) and my daughter. During this session we have finished the prototype but not had the time to flash the AtMega328P.

Now this is done using my Arduino Leonardo as an ISP programmer. I’ll detail the way I’ve done it here

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Make you own PCB

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I recently created a printed circuit board for a raspberry PI design i’m working on. By the past, when I did such things, the cost to make it was not accessible for a home made design. In 10 years things have change a lot and now, you can do it for less than 100€ for a 10×10 two layer board. 4 layer is also something accessible.

I want to share with you this experience, because, I had a good and an bad experience to share.

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Draw your circuit with a pen – electronic for fun & childs

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You can imagine a lot of use cases for a such thing : a pen able to create electrical conductivity over ink. The one I found really interesting this morning is to make electronic a fun activity for my daughter. That’s the reason why I backed on this product.

This is a kickstarter project accessible for a couple of euros. I let you have a look to the project itself here .

 

 

New arduino Galileo ready for orders

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Galileo is an Intel platform compatible with arduino ; more of that it is an embedded Pentium class platform. With 400MHz and 800mA and 55€ with Ethernet but no video out, I’m not totally sure this platform provides a real new thing in the embedded world.

By the way, it have some interesting advantages :

  • Compared to usual arduino platform, you have a really more powerfull system for the price of a small arduino + ethernet shield. Making this board interesting.
  • Compared to ARM based board, for a couple of Euro more, you have a full x86 compatible platform (32b) where you can run most of the existing x86 code.

I let you have your own advice, to take a look to the detailed description here and buy it here (actually 9w delay)